Oats (old-fashioned or quick-cooking): grams to cups
Quick answer: King Arthur Baking lists 1 cup of oats (old-fashioned or quick-cooking) at 89 g, which works out to 89 g per US cup, 5.6 g per tablespoon and 1.85 g per teaspoon. So 100 g of oats (old-fashioned or quick-cooking) is about 1 1/8 cup (1.12 cups).
Checked Oct 23, 2026. King Arthur lists 1 cup of all-purpose flour as 120 g. 100 g ÷ 120 g = 0.833 cup, which this converter shows as 0.833 cups and rounds to the nearest kitchen measure, 7/8 cup.
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Oats (old-fashioned or quick-cooking): grams per cup
King Arthur Baking lists 1 cup of oats (old-fashioned or quick-cooking) at 89 g, which works out to 89 g per US cup, 5.6 g per tablespoon and 1.85 g per teaspoon. So 100 g of oats (old-fashioned or quick-cooking) is about 1 1/8 cup (1.12 cups).
Oats are light and fluffy; old-fashioned and quick oats weigh differently.
Grams to cups chart
Grams
Kitchen measure
Cups (decimal)
Tablespoons
25 g
1/4 cup
0.281
4.5
50 g
1/2 cup
0.562
9
100 g
1 1/8 cup
1.124
18
125 g
1 3/8 cup
1.404
22.5
150 g
1 2/3 cup
1.685
27
200 g
2 1/4 cup
2.247
36
250 g
2 3/4 cup
2.809
44.9
300 g
3 3/8 cup
3.371
53.9
400 g
4 1/2 cup
4.494
71.9
500 g
5 5/8 cup
5.618
89.9
1000 g
11 1/4 cup
11.236
179.8
Cups to grams
Volume
Grams
Ounces
1/4 cup
22 g
0.78 oz
1/3 cup
30 g
1.05 oz
1/2 cup
44 g
1.57 oz
2/3 cup
59 g
2.09 oz
3/4 cup
67 g
2.35 oz
1 cup
89 g
3.14 oz
1 tablespoon
6 g
0.2 oz
1 teaspoon
2 g
0.07 oz
Source: King Arthur Baking, Ingredient Weight Chart. Kitchen measures are rounded to the nearest common cup fraction.
